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My Check engine light is on and after I reset it, it came back on. I not sure if it was the VALVOLINE FUEL INJECTOR CLEANER that I used because after using a few gallons after the fill up that included the cleaner the light came back on. I'm noticing a difference in the Idle (RPMs)when I shift in park: Under 1 RPM, @ 1 RPM, and slighly above 1 RPM, but when I'm in drive its OK except for a very infrequent increase in RPMs which returns to normal and is normal approx. 95% of the time. I was also wondering: Does a 94 850 w/sunroof come with a single oxygen sensor or a front& back.
I would appreciate any replies that could help in any way
THANKS
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